Ryobi 31cc engine setup
11-29-2006 | 04:22 AM
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From: rockhampton, AUSTRALIA
RE: Ryobi 31cc engine setup
my curiosity about this tygon fuel line thing has gotten the better of me and so i paid a visit to my mates shop to find out what fuel line i have.
it turns out that its made by dubro and its part number is either #505 or #506....i cant remember which one i have in my plane but those are the numbers.
it turns out that its made by dubro and its part number is either #505 or #506....i cant remember which one i have in my plane but those are the numbers.
11-29-2006 | 12:44 PM
#52
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RE: Ryobi 31cc engine setup
Here's some fuel line for just over half a buck a foot. It won't get hard or brittle with either gasoline or "Gas/Glow". It is flexible, but not quite flexible enough for the clunk line inside the tank. For that I use high quality rubber line like original equipment. It's hard to find sometimes....
Two links:
http://www.rotaxparts.net/Scripts/pr...?idproduct=566
http://www.rotaxparts.net/Scripts/pr...?idproduct=563
I also use the hardware store plastic tubing on smoke systems and fuel system lines that don't need to stay flexible. It will harden over time, but I've never seen it get hard enough to break. It's not a bad idea to replace the lines from time to time anyway. The line I've listed above is very good however, and will last a long, long time.
AV8TOR
Two links:
http://www.rotaxparts.net/Scripts/pr...?idproduct=566
http://www.rotaxparts.net/Scripts/pr...?idproduct=563
I also use the hardware store plastic tubing on smoke systems and fuel system lines that don't need to stay flexible. It will harden over time, but I've never seen it get hard enough to break. It's not a bad idea to replace the lines from time to time anyway. The line I've listed above is very good however, and will last a long, long time.
AV8TOR
12-03-2006 | 11:34 AM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
Well last night I !QUOT!test!QUOT! mounted the engine on my airplane, and it looks pretty sweet! Due to space, I need some hex bolts in order to mount it onto the firewall, but the hex bolts didn't fit the blind nuts I bought, even though they were the same size. I found some old bolts and threw the engine on minus the carburetor assembly, and it looks pretty good! I only ran into one problem though, the compression. It seems VERY low, but there is some. I plugged up the carburetor hole on the backplate and turned it over pretty easily, and I can hear what sounds like air leaking out somewhere. I took off the plug and did it a few more times and I can feel that there is compression, however its slight. I checked my gaskets and replaced the backplate and muffler ones, but it still happened. The head gasket was new and it looked and worked fine. Maybe its the piston ring? I'm not sure, anyways, I'm off to home depot again to pick up some bolts that will actually fit.
Also, Ive been having radio problems where literally every single piece of equipment has gone bad all at the exact same time. I sent it to Radio South and they did nothing besides tell me what I already knew. I haven't flown in a good 3 months because they've had all my stuff! Oh well, I guess Ill have to send it into Futaba and Hitec if I want this problem fixed.
Colin C
Also, Ive been having radio problems where literally every single piece of equipment has gone bad all at the exact same time. I sent it to Radio South and they did nothing besides tell me what I already knew. I haven't flown in a good 3 months because they've had all my stuff! Oh well, I guess Ill have to send it into Futaba and Hitec if I want this problem fixed.
Colin C
12-04-2006 | 04:40 AM
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From: rockhampton, AUSTRALIA
RE: Ryobi 31cc engine setup
ORIGINAL: predator500
Well last night I !QUOT!test!QUOT! mounted the engine on my airplane, and it looks pretty sweet! Due to space, I need some hex bolts in order to mount it onto the firewall, but the hex bolts didn't fit the blind nuts I bought, even though they were the same size. I found some old bolts and threw the engine on minus the carburetor assembly, and it looks pretty good! I only ran into one problem though, the compression. It seems VERY low, but there is some. I plugged up the carburetor hole on the backplate and turned it over pretty easily, and I can hear what sounds like air leaking out somewhere. I took off the plug and did it a few more times and I can feel that there is compression, however its slight. I checked my gaskets and replaced the backplate and muffler ones, but it still happened. The head gasket was new and it looked and worked fine. Maybe its the piston ring? I'm not sure, anyways, I'm off to home depot again to pick up some bolts that will actually fit.
Also, Ive been having radio problems where literally every single piece of equipment has gone bad all at the exact same time. I sent it to Radio South and they did nothing besides tell me what I already knew. I haven't flown in a good 3 months because they've had all my stuff! Oh well, I guess Ill have to send it into Futaba and Hitec if I want this problem fixed.
Colin C
Well last night I !QUOT!test!QUOT! mounted the engine on my airplane, and it looks pretty sweet! Due to space, I need some hex bolts in order to mount it onto the firewall, but the hex bolts didn't fit the blind nuts I bought, even though they were the same size. I found some old bolts and threw the engine on minus the carburetor assembly, and it looks pretty good! I only ran into one problem though, the compression. It seems VERY low, but there is some. I plugged up the carburetor hole on the backplate and turned it over pretty easily, and I can hear what sounds like air leaking out somewhere. I took off the plug and did it a few more times and I can feel that there is compression, however its slight. I checked my gaskets and replaced the backplate and muffler ones, but it still happened. The head gasket was new and it looked and worked fine. Maybe its the piston ring? I'm not sure, anyways, I'm off to home depot again to pick up some bolts that will actually fit.
Also, Ive been having radio problems where literally every single piece of equipment has gone bad all at the exact same time. I sent it to Radio South and they did nothing besides tell me what I already knew. I haven't flown in a good 3 months because they've had all my stuff! Oh well, I guess Ill have to send it into Futaba and Hitec if I want this problem fixed.
Colin C
has the engine been taken apart at all?? if it has then maybe the gaskets arent sealing as they should. just because a gasket "looks ok" doesnt always mean its sealing proper. get some soapy water and a small paint brush and go over ALL gaskets looking for any bubbles as you turn the engine over slowly. this is the easiest way to find a leak if there are any.
what sort of "radio problems" are you having?? could you please be VERY specific as to what is happening. under what conditions do the problems occur?? does it happen when the gear is in the airframe??...or on the test bench??. what parts of your gear are giving you problems??.
cheers
craig
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the fair dinkum ridgy didge aussie........AUSSIE AUSSIE AUSSIE OI OI OI
12-04-2006 | 08:46 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
Ill start with the engine, then my radio problem after.
The engine actuially is fine, I got some soapy water and went over all the gaskets, no leaks at all! I think it might just be the piston ring really. I put in a new plug, cut the cowl out to fit the engine (that flywheel made me butcher a LOT of cowl in order for it to fit!), and now besides a tank its ready to go! I hope to start soon!
Okay, my radio problem. I have two transmitters, a 7CAP and a SkySport 4 that came with my origional trainer. I have 5 recievers, three Futaba R127DF's, a Hitec micro 555, and a Hitec Supreme. This started back in July, I would range check my airplane and after walking back about 10 feet, the servos would start to chatter, throw surfaces, and finially the plane would turn off. I tried this with both transmitters and all 5 recievers and it happened to all of them. I switched between 3 different batteries, all of them new, still the same thing. This happens both inside and outside the airframe. I sent everything into Radio South, a radio repair place, and they claimed everything was fixed. Well sure enough everything was exactially the same as it was before. I sent it to them again under warranty, and recieved a call saying "your Futaba recievers are hypersensative but everything else is fine" which was not the case as everything was still broken. Now Ive been without flying for about half a year, and its all due to this problem. Im thinking about sending everything to Futaba and Hitec for them to fix. Its just odd that every piece of radio equipment I have went bad literally overnight. I even tried switching transmitters with a buddy of mine, and his plane chattered with my transmitter and my plane chattered with his, but his plane was and is perfectly fine. It really points nowhere as far as where to look to see the source of the problem. Im just going to send everything in, hopefully Ill have better luck this time.
Colin C
The engine actuially is fine, I got some soapy water and went over all the gaskets, no leaks at all! I think it might just be the piston ring really. I put in a new plug, cut the cowl out to fit the engine (that flywheel made me butcher a LOT of cowl in order for it to fit!), and now besides a tank its ready to go! I hope to start soon!
Okay, my radio problem. I have two transmitters, a 7CAP and a SkySport 4 that came with my origional trainer. I have 5 recievers, three Futaba R127DF's, a Hitec micro 555, and a Hitec Supreme. This started back in July, I would range check my airplane and after walking back about 10 feet, the servos would start to chatter, throw surfaces, and finially the plane would turn off. I tried this with both transmitters and all 5 recievers and it happened to all of them. I switched between 3 different batteries, all of them new, still the same thing. This happens both inside and outside the airframe. I sent everything into Radio South, a radio repair place, and they claimed everything was fixed. Well sure enough everything was exactially the same as it was before. I sent it to them again under warranty, and recieved a call saying "your Futaba recievers are hypersensative but everything else is fine" which was not the case as everything was still broken. Now Ive been without flying for about half a year, and its all due to this problem. Im thinking about sending everything to Futaba and Hitec for them to fix. Its just odd that every piece of radio equipment I have went bad literally overnight. I even tried switching transmitters with a buddy of mine, and his plane chattered with my transmitter and my plane chattered with his, but his plane was and is perfectly fine. It really points nowhere as far as where to look to see the source of the problem. Im just going to send everything in, hopefully Ill have better luck this time.
Colin C
12-04-2006 | 10:19 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
^Yes, but if that was referring to possible interference, all those problems happened on my glow planes or just the radio system on its own. I really dont know whats up.
But yes I bought a resistor plug.
Colin C
But yes I bought a resistor plug.
Colin C
12-05-2006 | 01:46 PM
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From: Rineyville,
KY
RE: Ryobi 31cc engine setup
I have several gassers.
One only does a range check adequately at about 20 feet. I fly it anyway.
Sometimes a fresh battery makes things chatter, until the voltage goes down.
Try to use a plastic nyrod for your throttle servo. Also make sure, for a gaser, that your receiver and battery are atleast 12 inches away.
if using Electronic ignition, make sure your receiver and battery are 12 inches away fromthe ignition battery as well.
Use a resistor plug, of course.
hope this helps.
billrad
12-06-2006 | 02:00 AM
#59
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RE: Ryobi 31cc engine setup
I've only had one that had a bad range check. It was a mag equipped engine I did for a friend. (All mine are either electronic ignition or Gas/Glow). His glitched like crazy at 20 feet. We didn't fly it of course, but installed braided shielding on the plug wire. The range check increased to 100 + feet with no glitching and it flies great.
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12-06-2006 | 03:44 AM
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From: rockhampton, AUSTRALIA
RE: Ryobi 31cc engine setup
ORIGINAL: predator500
Ill start with the engine, then my radio problem after.
The engine actuially is fine, I got some soapy water and went over all the gaskets, no leaks at all! I think it might just be the piston ring really. I put in a new plug, cut the cowl out to fit the engine (that flywheel made me butcher a LOT of cowl in order for it to fit!), and now besides a tank its ready to go! I hope to start soon!
Okay, my radio problem. I have two transmitters, a 7CAP and a SkySport 4 that came with my origional trainer. I have 5 recievers, three Futaba R127DF's, a Hitec micro 555, and a Hitec Supreme. This started back in July, I would range check my airplane and after walking back about 10 feet, the servos would start to chatter, throw surfaces, and finially the plane would turn off. I tried this with both transmitters and all 5 recievers and it happened to all of them. I switched between 3 different batteries, all of them new, still the same thing. This happens both inside and outside the airframe. I sent everything into Radio South, a radio repair place, and they claimed everything was fixed. Well sure enough everything was exactially the same as it was before. I sent it to them again under warranty, and recieved a call saying "your Futaba recievers are hypersensative but everything else is fine" which was not the case as everything was still broken. Now Ive been without flying for about half a year, and its all due to this problem. Im thinking about sending everything to Futaba and Hitec for them to fix. Its just odd that every piece of radio equipment I have went bad literally overnight. I even tried switching transmitters with a buddy of mine, and his plane chattered with my transmitter and my plane chattered with his, but his plane was and is perfectly fine. It really points nowhere as far as where to look to see the source of the problem. Im just going to send everything in, hopefully Ill have better luck this time.
Colin C
Ill start with the engine, then my radio problem after.
The engine actuially is fine, I got some soapy water and went over all the gaskets, no leaks at all! I think it might just be the piston ring really. I put in a new plug, cut the cowl out to fit the engine (that flywheel made me butcher a LOT of cowl in order for it to fit!), and now besides a tank its ready to go! I hope to start soon!
Okay, my radio problem. I have two transmitters, a 7CAP and a SkySport 4 that came with my origional trainer. I have 5 recievers, three Futaba R127DF's, a Hitec micro 555, and a Hitec Supreme. This started back in July, I would range check my airplane and after walking back about 10 feet, the servos would start to chatter, throw surfaces, and finially the plane would turn off. I tried this with both transmitters and all 5 recievers and it happened to all of them. I switched between 3 different batteries, all of them new, still the same thing. This happens both inside and outside the airframe. I sent everything into Radio South, a radio repair place, and they claimed everything was fixed. Well sure enough everything was exactially the same as it was before. I sent it to them again under warranty, and recieved a call saying "your Futaba recievers are hypersensative but everything else is fine" which was not the case as everything was still broken. Now Ive been without flying for about half a year, and its all due to this problem. Im thinking about sending everything to Futaba and Hitec for them to fix. Its just odd that every piece of radio equipment I have went bad literally overnight. I even tried switching transmitters with a buddy of mine, and his plane chattered with my transmitter and my plane chattered with his, but his plane was and is perfectly fine. It really points nowhere as far as where to look to see the source of the problem. Im just going to send everything in, hopefully Ill have better luck this time.
Colin C
with your radio problem.....do your glitching problems happen reguardless if your gear is inside a room as well as outside??? i personally hate hitec gear..ive had more problems with hitec gear than ive had hot sunday lunches. i personally use jr gear exclusively. are your recievers pcm or fm(ppm)??? do you fully extend your transmitter antennas?? i would be asking exactly what the repair shop did to your gear and what tests they did to find the fault. our type of radios/recievers/servos are not liked by a lot of radio repair shops. i know this is a silly question but are your transmitters/recievers all on the same frequency???
12-06-2006 | 05:14 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
ORIGINAL: hardtop351
with your radio problem.....do your glitching problems happen reguardless if your gear is inside a room as well as outside??? i personally hate hitec gear..ive had more problems with hitec gear than ive had hot sunday lunches. i personally use jr gear exclusively. are your recievers pcm or fm(ppm)??? do you fully extend your transmitter antennas?? i would be asking exactly what the repair shop did to your gear and what tests they did to find the fault. our type of radios/recievers/servos are not liked by a lot of radio repair shops. i know this is a silly question but are your transmitters/recievers all on the same frequency???
with your radio problem.....do your glitching problems happen reguardless if your gear is inside a room as well as outside??? i personally hate hitec gear..ive had more problems with hitec gear than ive had hot sunday lunches. i personally use jr gear exclusively. are your recievers pcm or fm(ppm)??? do you fully extend your transmitter antennas?? i would be asking exactly what the repair shop did to your gear and what tests they did to find the fault. our type of radios/recievers/servos are not liked by a lot of radio repair shops. i know this is a silly question but are your transmitters/recievers all on the same frequency???
Colin C
12-10-2006 | 03:51 PM
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From: rockhampton, AUSTRALIA
RE: Ryobi 31cc engine setup
it is interesting to note how much futaba gear is used over there in america. here in australia we use all 3 major brands. im an exclusive user of jr gear...i wont touch hitec...and futaba would be my second choice if i went to another brand of gear.
the short 5-20 feet range test tells me that yes there is something wrong with your gear but i dont know either. perhaps setting a frequency scanner to your channel may provide you with some answers if there is interferrence being present.
the short 5-20 feet range test tells me that yes there is something wrong with your gear but i dont know either. perhaps setting a frequency scanner to your channel may provide you with some answers if there is interferrence being present.
12-10-2006 | 06:05 PM
#63
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RE: Ryobi 31cc engine setup
Yeah, that's just too weird that ALL your equipment is malfunctioning and that it happened all at once. I strongly suspect a new source of interference in your area. Try to find a way to check for local interference, buy some crystals and try other frequencies, etc. Radios can't get viruses and all get sick at the same time!! There has got to be a common denominator here, and I think sending your radios in again is going to be a waste of time. If there are no common components whatsoever in the separate systems, it just about has to be outside interference.
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12-10-2006 | 09:05 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
^Thats what I thought too, but I dont think its the case. I switched all the crystals maybe twice now sence this started happening, and still the same thing. It happens both at my house and at the flying field with both my 7CAP and Skysport. If I cant fly at my field, then whats the point? I just sent it in because Im tired of messing with it and I need to get in the air soon. Its a real mystery! Plus, Im also a glider/sailplane pilot (full scale), and I havent had a soaring fix sence July! This engine and building my Cap have kept me sane the last 5 months! Not bad for only being 16 eh?
Colin C
Colin C
12-10-2006 | 11:42 PM
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From: Superior,
AZ
RE: Ryobi 31cc engine setup
when your switching these crystals around your not mixing a low band crystal with a high band reciever or vice versa are you.on my hitecs it doesnt matter you just worry about shift but it does matter on the 127 futabas.I had a similier problem with a flight pack.had 2 of them fully charged,measured 5. somthing volts.one would chatter servos,one wouldnt.i peeled the shrink wrap off the one and there was a little green spot of erosion on the solder joint but it read fully charged.how old are the packs in yout TXs.I had a battery in my kyosho TX do this once also,it was the series 91 air that uses 2-4.8s.
12-13-2006 | 10:42 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
The packs in my 7CAP is brand new and my SkySport 4 is about 4 years old. I bought all my recievers on channel 38, so Im sure all of them are on the same band. For my CAP I ordered two 1600mah batteries for the RC setup, so those shouldent be bad (I have not receved them yet though). Ill let you know more when I hear from Futaba.
Colin C
Colin C
12-23-2006 | 03:55 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
Okay time for a little update. The Cap is DONE! Everything is ready to go, except for the missing receiver which is at Futaba currently. I got everything completed last night, and maybe tonight Ill try and fire up the engine. I am a little concerned about the compression though, I think I might buy a piston ring kit if the engine doesn't run very well.
As for my radio problems, I sent all my Futaba gear straight to Futaba and should get everything back by the end of the week. On my list of repaired parts was "CPU" for the 7CAP and "Ceramic Filter" for the receivers, so Im guessing that those were the problems. We shal see.
Colin C
As for my radio problems, I sent all my Futaba gear straight to Futaba and should get everything back by the end of the week. On my list of repaired parts was "CPU" for the 7CAP and "Ceramic Filter" for the receivers, so Im guessing that those were the problems. We shal see.
Colin C
12-23-2006 | 04:19 PM
#68
RE: Ryobi 31cc engine setup
The compression may get better the more you run the Ryobi 31cc engine. If it does not , you can get a Bowman piston ring which should really help. That is if you do not have scratches in the cylinder bore. Hope you get it all running good. Best Regards Capt,n
12-24-2006 | 03:36 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
Well I didnt run the engine like I thought I would have, never got around to it. But here are some pictures for now.
Colin C
Colin C
01-27-2007 | 09:17 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
Okay I have good news and bad news.
The good news is not only did I sort out my radio problem, but I finally got to start my engine! Horray, right? WRONG!
The bad news is that I dont think the carb is pulling in fuel. The engine runs fine on the fuel that it is primed with via primer bulb, but once that runs out, it quits. I cant see fuel flowing through the carb line from the primer bulb, or from the tank to the bulb for that matter. I have all of my lines tightened down with some fishing line (it works great, surprisingly) and it does not appear to have an air leak anywhere. Does anybody know what the problem might be here? Could it be the carb or something else?
Well anywho, Im glad to know that it actually runs, and it sounds great! Hopefully it'll pull around my Cap nicely, it weighs about 12 lbs wet. Also, I need to give it some tail weight, its WAY nose heavy!
Colin C
The good news is not only did I sort out my radio problem, but I finally got to start my engine! Horray, right? WRONG!
The bad news is that I dont think the carb is pulling in fuel. The engine runs fine on the fuel that it is primed with via primer bulb, but once that runs out, it quits. I cant see fuel flowing through the carb line from the primer bulb, or from the tank to the bulb for that matter. I have all of my lines tightened down with some fishing line (it works great, surprisingly) and it does not appear to have an air leak anywhere. Does anybody know what the problem might be here? Could it be the carb or something else?
Well anywho, Im glad to know that it actually runs, and it sounds great! Hopefully it'll pull around my Cap nicely, it weighs about 12 lbs wet. Also, I need to give it some tail weight, its WAY nose heavy!
Colin C
01-28-2007 | 06:44 AM
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From: clinton twp,
MI
RE: Ryobi 31cc engine setup
could be lots of stuff,make sure your fuel line is on the correct carb nipple. take the carb off and make sure the pulse hole is clear and that the gasket isnt covering it . is the carb clean ?any leaks in the lower half of the engine will not allow suction for the pulse to pull fuel to the carb . carefully remove the steel diaphram cover , remove and inspect the rubber diaphram look for holes , replace as neccesary. pull needles from carb while it is off and dissasembled spray carb cleaner thru needles and clean needles let dry , re assemble
01-28-2007 | 02:52 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
^I have two carbs, a Zama and a Walbro, both from Ryobi's. I threw the Zama on today and it did the same thing. I took both carbs apart and both are perfectly fine internally. I took off the primer bulb and noticed that it does in fact draw fuel with the choke on. It fires maybe once, then stops. I turned off the choke and it stopped pulling fuel and does not fire at all. Im starting to think that maybe my tank placement it bad and that its pinching off some lines or I have an air leak somewhere. Im going to keep the primer bulb off from now on and plug the return line, but I also have to plug the hole in the fuel tank that the return line went to. Im going to mess with it more on tuesday, Ill let you guys know what happens, but please let me know if there is anything else I need to check!
Colin C
Colin C
01-28-2007 | 05:41 PM
#73
RE: Ryobi 31cc engine setup
predator500: You may have to check the reed valve to see if its clean and not bent. It acts like a one way valve allowing fue/air mix to enter crankcase on up-stroke of piston. On downstroke it has got to close so the air/fuel mix will not flow back out carb and travel through by-pass ports into cyl. There are guys out there that can tell you how to fine tune the reeds. Best Regards Capt,n
01-28-2007 | 07:28 PM
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From: sarasota, FL
RE: Ryobi 31cc engine setup
Wait, now Im a bit confused, was I not supposed to open up the reed valve to the size of an 1/8" allen wrench? I did that because someone on page 2 told me too. Could that be the problem??
01-28-2007 | 09:13 PM
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From: clinton twp,
MI
RE: Ryobi 31cc engine setup
yes, if you opened up the reed valve and not the reed valve stop. this will prevent a vacum to form in the case no pulse = no fuel pump action = no fuel. take the cover back off and flip the reed valve (the thin springy metal flap) over . the thick metal bracket y thing is the reed stop bend this out carefully so a 1/8 inch allen wrench will fit between it and the reedvalve all thew way to the botom where it screws on to the back plate . or just leave it stock for now .you can allways bend it out later. this could be the sorce of air leaking sound that you heard earlyer. hope this is it. good luck!
